28686138229 has 4 divisors (see below), whose sum is σ = 32784157984. Its totient is φ = 24588118476.

The previous prime is 28686138163. The next prime is 28686138233. The reversal of 28686138229 is 92283168682.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28686138229 - 2¹³ = 28686130037 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28686138229.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28686138289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2049009867 + ... + 2049009880.

It is an arithmetic number, because the mean of its divisors is an integer number (8196039496).

Almost surely, 2^28686138229 is an apocalyptic number.

It is an amenable number.

28686138229 is a deficient number, since it is larger than the sum of its proper divisors (4098019755).

28686138229 is an equidigital number, since it uses as much as digits as its factorization.

28686138229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4098019754.

The product of its digits is 3981312, while the sum is 55.

The spelling of 28686138229 in words is "twenty-eight billion, six hundred eighty-six million, one hundred thirty-eight thousand, two hundred twenty-nine".